<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <p class="change_color">代码</p>
    <style>
        .change_color{
            color: red;
            border: 1px solid orange;
            background-color: yellow;
            text-align: center;
            width: 200px;
            height: 300px;
            margin: 0 auto;
            
        }
    </style>
</body>
</html>